My boyfriend and I just moved in together and want...

My boyfriend and I just moved in together and wanted to adopted a kitten. I already have a 6 year old. Now we absolutely love the kitten but 5 days after we brought him home my 6 year old cat started to get sick. Turns out after a $300 vet trip she had an upper respiratory infection given to her via the kitten. Last year when I lived at home my parents adopt 3 kittens all from Jacksonville humane society and NONE had given my cat an upper respiratory infection. We will NEVER adopt another cat or animal from this humane society.